L-Tyrosine USP/FCC


(S)-2-Amino-3-(4-hydroxyphenyl)propionic acid; 3-(4-Hydroxyphenyl)-L-alanine; 4-hydroxyphenylalanine,
L-Tyrosine;Tyrosine, L-;«alpha»-Amino-«beta»-(4-hydroxyphenyl)propionic acid;(-)-«alpha»-Amino-p-hydroxyhydrocinnamic acid;p-Tyrosine;Benzenepropanoic acid,
«alpha»-amino-4-hydroxy-, (S)-;L-p-Tyrosine;L-Phenylalanine, 4-hydroxy-;Propanoic acid,
2-amino-3-(4-hydroxyphenyl)-, (S)-;L-Tryosine;L-2-Amino-3-p-hydroxyphenylpropanoic acid

Technical Data

CAS Number: 60-18-4
Molecular Formula: C9H11NO3
Molecular Weight: 181.19
Beilstein Registry Number: 392441
EC Number: 200-460-4

FabriChem Specifications

DescriptionWhite crystalline powder or colorless crystals
Infrared Absorption*
Passes Test
Specific Optical Rotation [a] 25 D-9.8° to -11.2°
Amino Acid HPLCMain Peak is Tyrosine
Chlorides≤ 400 ppm
Sulfates≤ 400 ppm
Heavy Metals (as Pb)≤ 15 ppm
Residual SolventsAs per USP
Iron≤ 30 ppm
Ninhydrin-positive substancesTLC
Loss on Drying0.3% Max.
Residue on Ignition0.4% Max.
Assay98.5 – 101.5%
Total Viable Aerobic Count≤ 100 CFU/g
Yeast & Mold≤10 CFU/g
E. ColiNegative / 10 g
SalmonellaNegative / 10 g
EnterobacteriaceaeNegative / 10 g
Pseudomonas AeruginosaNegative / 10 g
Staphylococcus Aureus (coagulase)Negative / 10 g

Molecular Structure



Tyrosine is one of the 22 amino acids that are used by cells to synthesize proteins. It is a non-essential amino acid with a polar side group. Tyrosine is an amino acid precursor of dopamine and other catecholamines.